คำตอบ - Long subtraction
6.7
คำอธิบายทีละขั้นตอน
1. Rewrite the numbers from top to bottom, aligned by their place values
| Place value | ones | . | tenths |
| 7 | . | 9 | |
| - | 1 | . | 2 |
| . |
2. Subtract the numbers using long subtraction method
Subtract the numbers in the tenths column from the top number:
9-2=7
| Place value | ones | . | tenths |
| 7 | . | 9 | |
| - | 1 | . | 2 |
| . | 7 |
Subtract the numbers in the ones column from the top number:
7-1=6
| Place value | ones | . | tenths |
| 7 | . | 9 | |
| - | 1 | . | 2 |
| 6 | . | 7 |
The solution is: 6.7
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